Multi-directional adjustable two-camera housing module for medical applications

Abstract

Modern laparoscopes are equipped with visible-light optical cameras that assist surgeons navigate human anatomy. However, as surgical procedures require precision, surgeons would benefit from auxiliary imaging technologies to reliably perform operations. To actualize this improvement, two cameras [near-infrared (NIR) and red-green-blue (RGB)] can be integrated into one housing module while maintaining centerpoint alignment and optimal image focus. We have designed a prototype that satisfies these requirements and features cameras that can be individually, translationally adjusted in the x, y, and z-directions. Tri-directional translation and tilt-angle fine-tuning allow the cameras to conform to the lens focal distance and ensure they capture the same visual field. To demonstrate the usefulness of this housing design, we characterize the specifications of optical alignment, field-of-views, and depth-of-focus and describe a custom fabricated snapshot imager for associated medical applications in real-time, intraoperative settings.Detailed info: The housing module consists of a casing module for each camera and a central cube that serves as an interface between the light-collection optics at the front of the cube and the two optical cameras. A dichroic filter, at 45-degrees, positioned within the cube transmits near-infrared wavelengths to the NIR camera at the back and reflects visible light to the RGB camera on the bottom. To improve image focus, the casing modules can be adjusted to move in and out of the cube and fine-tuned by varying the relative mounting screw tensions. Slots and spacers allow for calibration between the cameras and ensure they have the same centerpoint.